infectious keratitis is an infection of the cornea, the clear front “window” of the eye. It can cause pain, redness, light sensitivity, and blurred vision. It is commonly discussed in urgent eye care, emergency settings, and contact lens–related care. Clinicians use the term to describe corneal infection that may threaten vision if severe.

keratitis means inflammation of the cornea, the clear “window” at the front of the eye. It can be caused by infection, injury, dryness, immune conditions, or exposure problems. It is a common diagnosis in eye clinics and emergency settings because it can affect vision and comfort. Clinicians use the term to describe both mild surface irritation and more severe corneal ulceration.

necrotizing scleritis is a severe form of scleritis, meaning deep inflammation of the white outer wall of the eye (the sclera). “Necrotizing” refers to tissue damage and breakdown that can lead to thinning of the sclera. It is a clinical diagnosis used in ophthalmology to describe a high-risk, potentially vision-threatening eye condition. It is often discussed alongside systemic autoimmune (body-wide immune) diseases and urgent eye inflammation care.

scleritis is inflammation of the sclera, the tough white outer coat of the eye. It is most often discussed in ophthalmology and optometry because it can be painful and sometimes threatens vision. scleritis can be linked to systemic (whole-body) inflammatory or autoimmune disease, but it can also occur without a known cause. The term is used clinically to describe a specific pattern of deep eye-wall inflammation that needs careful evaluation.

episcleritis is an inflammation of the episclera, a thin tissue layer on the surface of the white of the eye. It commonly causes a localized or diffuse patch of eye redness and mild discomfort. The term is used in eye care to describe a generally superficial, non–vision-threatening cause of “red eye.” Clinicians use the diagnosis to separate episcleritis from deeper, more serious inflammation such as scleritis.

conjunctivochalasis is a condition where the clear membrane covering the white of the eye becomes loose and forms folds. These folds most often appear along the lower edge of the eyeball near the eyelid margin. It is commonly discussed in dry eye and ocular surface clinics because it can mimic or worsen irritation and tearing. The term is used by ophthalmologists and optometrists in exams, diagnoses, and treatment planning.

giant papillary conjunctivitis is an inflammatory condition of the inner eyelid surface. It features enlarged “papillae” (small, raised bumps) on the upper eyelid lining. It is commonly associated with contact lens wear or other long-term eye surface friction. Clinicians use the term to describe a recognizable exam pattern and symptom cluster.

atopic keratoconjunctivitis is a chronic, allergic inflammation of the conjunctiva and the cornea. It is most often associated with atopic disease, especially atopic dermatitis (eczema). It can cause long-term eye surface irritation and, in some cases, corneal complications that affect vision. The term is commonly used in ophthalmology and optometry to describe a specific, persistent form of allergic eye disease.

vernal keratoconjunctivitis is a chronic, allergic inflammation of the conjunctiva and sometimes the cornea. It typically causes intense itching, redness, tearing, and light sensitivity, often with thick mucus. It is most often discussed in eye clinics when evaluating recurring “allergic eye” symptoms in children and teens. The term is commonly used by ophthalmologists and optometrists as a specific diagnosis within allergic eye disease.

allergic conjunctivitis is inflammation of the conjunctiva (the thin, clear tissue covering the white of the eye and inner eyelids) triggered by an allergy. It commonly causes itching, redness, and watery eyes, often in certain seasons or after exposure to specific allergens. The term is used in eye clinics, primary care, and urgent care to distinguish allergy-related “pink eye” from infectious and other causes. It is a diagnosis and clinical pattern, not a single procedure.

bacterial conjunctivitis is inflammation of the conjunctiva caused by bacteria. The conjunctiva is the thin, clear tissue that covers the white of the eye and lines the inside of the eyelids. It is commonly discussed in eye clinics, urgent care settings, schools, and workplaces because it can be contagious. People often recognize it by redness and discharge, but an eye exam is used to confirm the likely cause.

adenoviral conjunctivitis is an eye infection where an adenovirus causes inflammation of the conjunctiva (the thin clear tissue covering the white of the eye and inner eyelids). It is a common cause of “pink eye” with redness, watery discharge, and irritation. It is discussed frequently in eye clinics, urgent care, and primary care because it is highly contagious and often spreads in groups. It is also a key topic in ophthalmology and optometry training because it can mimic other red-eye conditions and sometimes involves the cornea.

viral conjunctivitis is inflammation of the conjunctiva caused by a virus. The conjunctiva is the thin, clear tissue covering the white of the eye and the inner eyelids. It commonly appears as “pink eye” with redness, tearing, and irritation. The term is used in eye clinics and primary care to describe a frequent, contagious cause of acute red eye.

conjunctivitis is inflammation of the conjunctiva, the thin clear tissue that lines the inside of the eyelids and covers the white of the eye. It commonly causes “red eye,” irritation, tearing, and sometimes discharge. In everyday language it is often called “pink eye,” though not all red eyes are conjunctivitis. The term is used in primary care, optometry, and ophthalmology to describe a common group of eye conditions with several different causes.

A chalazion is a usually non-infectious lump in the eyelid caused by a blocked oil (meibomian) gland. It often feels like a firm, round bump within the lid rather than a surface blister. It is commonly discussed in eye clinics because it can look similar to other eyelid conditions. The term is used in ophthalmology and optometry for diagnosis, documentation, and treatment planning.

A stye is a small, tender lump on the eyelid caused by inflammation and infection of an eyelid gland. It is commonly called a “stye” in everyday language and “hordeolum” in clinical settings. It most often appears near the eyelashes or just inside the eyelid margin. People commonly use the term when describing a sudden, painful “pimple-like” eyelid bump.

An external hordeolum is an acute (sudden-onset) localized eyelid infection that forms near the lash line. It is commonly called a “stye,” though “stye” is sometimes used more broadly in everyday language. It usually appears as a tender, red bump on the outer eyelid margin. The term is used in eye clinics and primary care to describe a specific eyelid gland infection.

An internal hordeolum is an acute, localized infection or inflammation inside the eyelid. It typically involves a blocked oil gland (a meibomian gland) and can form a tender lump. Many people recognize it as a type of “stye,” but it occurs on the inner side of the lid. The term is used in eye clinics to describe a common cause of sudden eyelid pain and swelling.

A hordeolum is an acute, localized infection of an eyelid gland. Many people know it as a “stye,” which usually appears as a tender eyelid bump. It is commonly discussed in primary care, optometry, and ophthalmology because it is frequent and usually recognizable. Clinicians use the term hordeolum to describe a specific type of inflamed eyelid lesion with characteristic anatomy and timing.

demodex blepharitis is an eyelid inflammation associated with Demodex mites living around the eyelashes and eyelid glands. It is commonly discussed in eye clinics when people have chronic “blepharitis” symptoms that don’t fully respond to routine care. The condition often involves irritation at the lash line and debris on the lashes. It is used as a clinical diagnosis to explain symptoms, guide testing, and select appropriate management options.